Stippling-pen.



J. H. VAUGHAN.

STIPPLING PEN.

' APPLICATION FILED OCT. 19.1 914.

1, 153,468. Patented Sept. 14, 1915.

WITNESSES:

ORNEY JAMES H. VAUGHAN, OF OAKLAND, CALIFORNIA.

STIPPLING-PEN.

Specification of Iietters Patent.

Patented Sept. 14, 1915.

Application filed October 19, 1914. Serial No. 867,453.

To all whom it may concern:

Be it known that 1, JAMES H. VAUGHAN, a citizen of the United States,residing at Oakland, in the county of Alameda and State of California,hay e invented new and useful Improvements in Stippling-Pens, of whichthe following is a specification.

This invention relates to a stippling pen which is particularly adaptedfor drawing plans where concrete is used. It will fill in the drawingsof forms, piers, walls, etc., and is also very useful in topographicalwork as it can be used to show trees, brush, swamp lands, fences, etc.

The object of the present invention is to 7 provide a pen of thecharacter described which is operated by an electric magnet withconnected armature; and another object of the invention is to provide anautomatically actuated switch for interrupting the current flow throughthe magnet.

Another object is to provide means for adjusting and cushioning thestroke of the pen.

Further objects will appear hereinafter.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompany ing drawings in which Figure l is a centralvertical section through the device at the instant of attraction ofarmature and opening the switch. Fig. 2 is a cross section on line 2-2,Fig. 1.

More specifically described, the pen as a whole consists of a casing Ain which is mounted a magnet coil 2, the core 3 of which is hollow.Extending through said hollow core is a driving rod 4, on the upper endof which is secured an armature 5 which is disk shaped.

Slidably mounted on the driving rod, between a shoulder 6 in the casingand the lower end of the magnet, is a switch member 7 which consists ofa soft iron disk 8 surrounded by a platinum ring 9. This ring is adaptedto close a circuit through the magnet when brought into engagement witha pair of contact members 10 and 11, and the circuit thus closed willenergize the core and attract or hold the soft iron disk (or what willbe hereinafter termed the switch armature) with connected platinum ringin engagement with the contact members. The main armature 5 is at thesame time attracted by the upper end of the core and will consequentlypull the driving rod in a downward direction. The downward movement is,however, limited by a collar 12 formed on the rod which engages with theswitch armature and pulls it away from the contact members. The magnetcircuit is thus broken and the driving rod will now be returned to itsnormal upper position by a coil spring 13 which is interposed between acollar 14 on the rod and a seat 15 in the casing.

The upward or return movement of the driving rod is transmitted throughan adjustable nut 16, mounted on a threaded section 17 on the rod, and aspring 18 to lift the switch armature, with connected platinum ring,into engagement with the contact members. The circuit through the magnetis thus again closed and the cycle of opera tion repeated.

The current is conducted from any suitable electrical source of supplyby wires 18 and 19 to the terminal block 20. One wire is then passeddown the side of the magnet and connected with the switch contact 10,while the other wire is connected with the upper terminal of the magnetcoil. A connection 21 is then made between the lower terminal of themagnet and switch contact 11. Engagement of the platinum ring, with thecontacts, will thus close a circuit through the coil while engagement ofshoulder 12, with the switch armature, will automatically break thecircuit on the completion of the downward stroke of the driving rod, thecircuit being again closed on the return upward movement of the drivingrod by spring 18, which lifts it into engagement with the contactmembers. The coil spring simply rests on the adjustable nut and whilethe pen is not in operation the spring will hold the switch armatureagainst its contacts. \Vhen the pen is in operation, this spring isfirst lowered away from the switch armature, which is now held up'by themagnet being in operation, giving it room to fall away from the contactswhen the circuit is broken by shoulder 12. Nut 16 by being adjusted willchange the time that it takes for the switch armature to be closed, asthe distance between coil spring 18 and the switch armature is increasedor decreased by the adjustable nut.

The pen proper, indicated at 20*, is made with fairly wide blades whichare set close together.

This allows the pen to hold a fair quantity of ink and at the same timeprevents splashing of the ink on the paper.

The pen is connected with or attached to the driving rod in thefollowing manner: 27 indicates a sliding bearing in the form of apiston, in the lower end of which the pen is secured by means of a nut22. The lower end of the driving rod enters the upper end of the slidingbearing and is provided with a plunger 23, between which and nut 22 acoil spring 24 is interposed. When at rest, this plunger is pressed upagainst the upper end of the bearing with a slight pressure. On the downstroke of the pen, when the pen point hits the paper and is unable to goany farther, the plunger in the piston bearing moves down and compressesthe spring. This action takes up most of the jar and keeps the pen fromdriving through the paper. It also allows the driving rod to completeits stroke irrespective of the time that the pen hits the paper.

The exterior casing is preferably reduced in diameter, as indicated at25 and 26, to produce a grip and shape most convenient for the hand.

The pen constructed as here shown may be used for indicating concrete informs, piers, walls, etc., and in topographical work for showing trees,brush, swamp lands, fences, etc.

The only change needed to adapt the pen for various kinds of work is achange of position in the hand of the person operating it.

The materials and finish of the several parts of the pen are such as theexperience and judgment of the manufacturer may dictate.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. In a stippling pen of the character described, thecombination with a casing having a hollow cored electromagnet mountedtherein, of a spring actuated driving rod extending through said core, amain armature plate secured to said rod which is adapted to be actuatedby the magnet, a pen connected with the driving rod, a pair of contactmembers with which the terminals of the magnet are connected, a switcharmature mounted below said contact members adapted to close a circuitthrough same, and means for automatically lifting the armature disk upinto engagement with the contact members when the magnet is deenergized.

2. In a stippling pen of the character described, the combination with acasing having an electromagnet mounted therein, of a, main armatureplate movable in relation thereto, a spring actuated driving rodconnected with the armature, a pen connected with the driving rod, and aswitch armature for automatically interrupting the current flow throughthe magnet and releasing the first named armature.

3. In a stippling pen of the character described, the combination with acasing having a hollow cored electromagnet mounted therein, of a springactuated driving rod extending through said core, a main armature platesecured to said rod and which is adapted to be actuated by the magnet inopposition to the spring, a pen connected with the driving rod, and aswitch automatically actuated by the driving rod for interrupting thecurrent flow through the magnet and releasing the armature.

4. In a stippling pen of the character described, the combination with acasing having an electromagnet mounted therein, of a main armaturemember movable in relation thereto, a driving rod connected and movablewith the armature, a pen connected to said rod, a spring connected withthe rod exerting its tension in opposition to the pull of the magnet,and a denergizing switch actuated by the movement of the rod.

5. In a stippling pen of the character described, the combination with acasing having an electromagnet mounted therein, of a main armaturemember movable in relation thereto, a driving rod connected with thearmature, a pen yieldingly connected to said rod, a spring connectedwith the rod exerting its tension in opposition to the pull of themagnet, and an armature switch actuated by the outward movement of therod to release the main armature.

6. In a pen of the character described, a. casing, a tubularelectromagnet, a reciprocally mounted driving rod in said magnet, anarmature carried by said rod, a sliding bearing, a pen secured to saidbearing, a coil spring interior of said bearing, a plunger on thedriving rod engageable with said spring, and an armature releasingswitch and a rod returning spring.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JAMES H. VAUGHAN. WVitnesses:

JoHN H. HERRING, W. W. HEALEY.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents,

Washington, D. O.

